WhatsApp may soon allow you to transfer chats between phone numbers: How the new WhatsApp feature will work

WhatsApp is developing a new feature that allows you to migrate your chat history to a different platform.

WhatsApp is finally working on a feature to transfer your WhatsApp chat history to a different platform in a future update for iOS and Android. This feature fixes the issue where a user could not restore the chat history after buying a device that’s not on the same operating system. It is not possible to restore your chat history from iCloud on WhatsApp for Android, and WhatsApp for iOS cannot restore the backup from Google Drive. WhatsApp is now working on a solution to migrate the chat history WhatsApp will streamline such a change in a future update. There will then be a menu option to switch to a new phone. This option explicitly asks if the phone number is also changed. WhatsApp says the step is only offered once: transferring chat history is only possible when changing phones and not after.